Weaknesses: Flandre is burnt when exposed to sunlight or roasted soybeans, and cannot cross flowing water, nor approach a broken holly branch or the head of a sardine. Vulnerable to spiritual attacks and the previously mentioned weaknesses.

Notable Attacks/Techniques:

Destruction of anything and everything: Flandre can supposedly destroy anything she wants. By moving the "eye" of the object - the place where the tension is highest - into her hand and pouring her power into it, she unconditionally destroys it. In other words, she crushes the eye and destroys the object. With this power, she easily destroyed a meteor without even touching it. According to Flandre, everything has an "eye", and she holds all the "eyes" in her hands.

Cloning herself: As seen in one of her spell cards, Flandre can clone herself, producing up to at least three clones that help her in battle. Grimoire of Marisa states that the clones "attack as they like", which could mean they're able to think independently to some grade. It's also categorized as a "Slave-type", meaning that, though they can act on their own, they are likely still under the original Flandre's control.